Ideal powerplant for 56 size aircraft-provides extra power for
hovering and 3-D type manuevers, also provides torque for turning
larger diameter props for more realistic scale filght
Broad power band suitable for Scale as well as Sport models
Same mounting bolt pattern as the FL-70 and FS-70 Ultimate
New 61N carburetor with extended intake tube eliminates reverse flow
tendency of air/fuel mixture, carb is reversible 180°
Blow-by internal oil system eliminates the need for a crankcase
breather fitting
Adjustable exhaust outlet direction and exhaust port to muffler
distance
Same muffler as the O.S. 81FS-a offers a pleasant exhaust sound with
a lower sound level
Two year limited warranty

Fuel: 10%-20% nitromethane with 18% lubricant. Synthetic, castor, or
a synthetic/castor lubricant blend may be used. NOTE: Certain four-cycle fuels cannot be used due to low oil content.
However, SOME four-cycle fuels such as the Wildcat 4-Cycle 15%
(CATP9109) may be used due to its 18% oil content.
When choosing fuels for this engine, be sure to select a fuel with
at least an 18% lubricant content. Propeller: Sport and aerobatic scale 12x7, 13x6-8, 14x6-7